Add CentOS 8 mirror

This adds mirroring of CentOS 8.  It is somewhat simpler because the
architecture we're interested in are in the base repos, no need for
altarch.

The current mirror doesn't have a 8/ directory; possibly they require
their own mirroring filter updates?  Use an up-to-date mirror for 8
(we can switch 7 too, but leaving alone for now).

Additionally, the altarch mirror we are using appears to have gone
offline for at least a few days.  Switch to another one that is in
Texas, which should be close-ish to the DFW servers.

Change-Id: I33d95fa6b2df23fbfdb6745a3079761e228f677b

playbooks/roles/mirror-update/files/centos-mirror-update

@@ -23,10 +23,31 @@ else
 fi
 
 BASE="/afs/.openstack.org/mirror/centos"
-MIRROR="rsync://mirror.lstn.net/centos"
-MIRROR_ALTARCH="rsync://dallas.tx.mirror.xygenhosting.com/centos-altarch/"
 K5START="k5start -t -f /etc/centos.keytab service/centos-mirror -- $TIMEOUT"
 
+#
+# -- Centos 8 --
+#
+
+MIRROR=rsync://mirror.hackingand.coffee/centos/8/ # somewhere in TX
+
+if ! [ -f $BASE/8 ]; then
+    $K5START mkdir -p $BASE/8
+fi
+date --iso-8601=ns
+echo "Running Centos 8 rsync..."
+$K5START rsync -rptDvz \
+    --delete \
+    --delete-excluded \
+    --exclude="isos" \
+    $MIRROR $BASE/8
+
+#
+# -- Centos 7 --
+#
+
+MIRROR="rsync://mirror.lstn.net/centos"
+MIRROR_ALTARCH="rsync://mirror.dal.nexril.net/centos-altarch/"
 REPOS="7 altarch/7"
 ALTARCHS="aarch64 ppc64le"
 ALTARCHS_IGNORED="armhfp i386 power9 ppc64 x86_64" # altarch/kernel/ has x86_64 dir we do not want